The MultiBlade 10 Bbased detector the cutting edge
The Multi-Blade 10 B-based detector the cutting edge of neutron reflectometry at ESS Francesco. Messi@nuclear. lu. se 1 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet
Overview • Multi-Blade • Scope and requirements • Design • Characteristics 2 • Characterisation • Gamma and fast-neutron sensitivity (@STF, Sweden) • Reflectometry (@ISIS, UK) • Count-rate and uniformity (@PSI, Switzerland) 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet • Next • Final design: MB-300 • IFE, Norway: MB-IFE
Multi-Blade: scope and requirements Ø ESS will be the world’s best source of neutrons for the study of materials Ø ESS will be 30 times brighter than ILL, the worlds’ best research reactor Ø ESS will be 10 times more intense than SNS, the world’s most powerful spallation source IEEE 2012 High demands on detectors ESS aerial photo Oct 2018 3 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet
Multi-Blade: scope and requirements sample q 4 l 2 l 3 l 1 detector q 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet
4 C su bs tra te anode wires cathode strips modular detector B holding frame Multi-Blade: design 10 MWPC two separate, individually tuneable, mediums benefit on gamma rejection neutrons sample 5 Multi-Blade Inclined geometry benefit on count-rate and conversion power 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet
Multi-Blade: time story June 2013 November 2015 March 2017 September 2018 MB 18 Multi-Blade MB 2 6 MB 15 MB 16 S MB 0 MB 1 MB 2 MB 15 MB 16 T MB 16 S MB 18 2012 2013 2015 2017 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet
Characterisation: gamma & fast-neutron @STF, Lund University – May 2016 and Mar 2017 Thermal neutron ∼ 0. 6 Fast neutron ∼ 10 -5 first characterization for a thermal n detector * Gamma ∼ 10 -8 ✓ Agreement with previous work 100 ke. V F. Piscitelli, F. Messi et al, “The Multi-Blade Boron- 10 -based Neutron Detector for high intensity Neutron Reflectometry at ESS” JINST (2017) G. Mauri, F. Messi et al, “Fast neutron sensitivity of neutron detectors based on boron-10 converter layers” JINST (2018) F. Messi, “Gamma- and Fast Neutron- sensitivity of 10 B-based neutron detectors at ESS” IEEE 2017 talk 7 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet
Characterisation: reflectometry @CRISP, ISIS – Oct 2017 conventional 0 D detector COLLIMATED 2 mm resolution detector Ir sample Fe/Ir supermirror Off-specular scattering 0. 5 mm resolution MB detector DIVERGENT COLLIMATED: 120 min measurement DIVERGENT: 14 min measurement q-dynamic range ~5 Of. M F. Piscitelli, F. Messi et al, “Characterization of the Multi-Blade 10 B-based detector at the CRISP reflectometer at ISIS for neutron reflectometry at ESS” JINST (2018) G. Mauri, F. Messi et al, “Neutron reflectometry with the Multi-Blade 10 B-based detector” PRS (2018) T. Ilves, Master thesis, “ 2 D Imaging with 10 B-Based Multi-Blade Neutron Detector”, Lund University (2018) A. Backis Master thesis, “ Neutron Reflectometry performed on an Iridium Sample using the Multi-Blade Detector ” Lund University (2018) 8 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet
Characterisation: count-rate & uniformity @AMOR, PSI – on-going now DAQ saturated @1. 3 103 n / mm 2 / s Not an easy measure: geometry problem MWPC shadow neutrons sample No shadow Multi-Blade The detector must sit at the designed distance from the sample !!! 9 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet
Characterisation: summary r e d n U ent m e r u meas r Unde ent urem s a e m 10 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet
Next: MB-300 and MB-IFE Active area: 300 x 508 mm 2 Number of blades: 50 Number of channels: 4800 11 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet
Summary üA long prototyping development (almost) completed ü (Almost) all requirements fulfilled Under ent rem ü Officially accepted technology for reflectometry at ESS measu ü Request to provide a MB detector @IFE Under ent rem measu ü Bibliography 12 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet
Bibliography F. Messi, G. Mauri and F. Piscitelli, “The Multi-Blade: The 10 Bbased neutron detector for reflectometry at ESS”. In: Nuclear Instruments and Methods in Physics Research Section A (2018). doi: 10. 1016/j. nima. 2018. 10. 058. url: https: //www. sciencedirect. com/science/article/pii/S 016890021831372 X? vi a%3 Dihub. G. Mauri, F. Messi, et al. “Neutron reflectometry with the Multi. Blade 10 B-based detector”. In: Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciences 474. 2216 (2018). doi: 10. 1098/rspa. 2018. 0266. url: F. Piscitelli, G. Mauri, F. Messi, et al. “Characterization of the Multi-Blade 10 B-based detector at the CRISP reflectometer at ISIS for neutron reflectometry at ESS”. In: Journal of Instrumentation 13. 05 (2018), P 05009. doi: 10. 1088/1748 -0221/13/05/P 05009. url: http: //stacks. iop. org/1748 -0221/13/i=05/a=P 05009. F. Piscitelli, F. Messi, et al. “The Multi-Blade Boron- 10 -based Neutron Detector for high intensity Neutron Reflectometry at ESS”. In: Journal of Instrumentation 12. 03 (2017), P 03013. doi: 10. 1088/1748 -0221/12/03/P 03013. url: http: //stacks. iop. org/1748 -0221/12/i=03/a=P 03013. http: //rspa. royalsocietypublishing. org/content/474/2216/20180266. G. Mauri, F. Messi, et al. “Fast neutron sensitivity of neutron detectors based on boron-10 converter layers”. In: Journal of Instrumentation 13. 03 (2018), P 03004. doi: 10. 1088/1748 -0221/13/03/P 03004. url: http: //stacks. iop. org/1748 -0221/13/i=03/a=P 03004. 13 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 F. Piscitelli, et al. “Study of a high spatial resolution 10 B-based thermal neutron detector for application in neutron reflectometry: the Multi-Blade prototype”. In: Journal of Instrumentation 9, P 03007 (2014); doi: 10. 1088/1748 -0221/9/03/P 03007. url: ar. Xiv: 1312. 2473 v 1. Francesco Messi, Lunds Universitet
Happy testing @AMOR, PSI Thank you for your attention! 14 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet
Backup slides 15 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 Francesco Messi, Lunds Universitet
Characterisation: gamma & fast-neutron @STF, Lund University – May 2016 and Mar 2017 Thermal neutron ∼ 0. 6 Fast neutron ∼ 10 -5 first characterization for a thermal n detector * Gamma ∼ 10 -8 ✓ Agreement with previous work Sensitivi ty: Cumu lative su 100 ke. V threshold m of cou nts
MB-15 17 MB-16 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 MB-18 Francesco Messi, Lunds Universitet MB-300
detector 576 ch FEE BUF 384 ch CAEN VME digitisers disk network n Remote access start/stop acq, data transfer and data visualization io Multiplicity 2 t nd rip g a c s rin b la ste t a u M r cl fo Strips AREA (CAEN) time stamp ch cassette Wire threshold Strip T = time stamp Wires Multiplicity 2 18 2018 IEEE Nuclear Science Symposium and Medical Imaging, Sydney, 14 November 2018 area vis (X, Y) (X, Y, T) 400 1 11 2000 Cluster: 1 wire 2 strips 401 1 35 1200 (11, 35. 4, 400) 400 1 36 800 … … MAX AMPLITUDE: (11, 35, 400) … (11, 35. 4, 400) … Co. G: 1268 1 13 1200 1269 1 14 400 1270 1 63 1600 … ua at liz Cluster: 2 wires 1 strip (13. 2, 63, 1268) … Francesco Messi, Lunds Universitet (Y, T)
detector area sample l 1 l l 2 q detector To. F detector 3 To. F of the reflected intensity q To. F (Time-Of-Flight) reflectometer l 1 0. 5 l 2 0. 5 6 Reflectometry is a technique to study SURFACES & INTERFACES 6Å To. F (or l) Line at constant q q ∝sin(q) / l l 3 2 l∝ 1/v = To. F / Distance Momentum transfer Log R = = reflected / incoming q =(4 p/l) sin(q) l 3 l 2 l 1 Neutron wavelength Incidence angle q
Working mode at CRISP Multi-Blade detector COLLIMATED LOWER RATE conventional sample q q Ir sample Multi-Blade detector DIVERGENT sample q l - q encoding Si sample Fe/Si sample q HIGHER RATE high intensity
Results Si Multi-Blade detector COLLIMATED LOWER RATE COLLIMATED sample q q Ir sample Si sample Fe/Si sample DIVERGENT Multi-Blade detector DIVERGENT sample q q HIGHER RATE The spatial resolution and the counting rate capability of the detector is needed to measure in divergent mode COLLIMATED: 120 min measurement DIVERGENT: 14 min measurement
Results Si q - Dynamic range Multi-Blade detector DIVERGENT HIGHER RATE sample q q 5 orders of magnitude with a poor shielding for background
Results Fe/Si Multi-Blade detector Off-Specular sample q Ir sample q Si sample Fe/Si sample To. F (or l) 0. 5 Fe. Si 2 6Å Parallel component of the scattering vector Q. Investigation of in-plane structures. The spatial resolution and uniformity is needed to identify the feature of off-specular reflectivity
Results Fe/Si All the features of the samples have been clearly identified MB design is ready to do science Off-specular scattering from Fe/Si neutron supermirror Specular Reflectivity Correlated roughness domains from the layers Supermirror edge (m=3. 8) on Si edge e pl S am iz r o No Transmitted beam, total reflection H Spin-flip scattering signal from the layers Transmitted beam through the sample
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